kc3-lang/angle
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Author :
Olli Etuaho
Date : 2016-05-20 13:55:24
Hash : 218cf9ee
Message : Fix unpacking overlapping unpack buffer rows on NVIDIA GL When unpack parameters are set so that rows being read overlap in the unpack buffer stored in GPU memory, NVIDIA GL driver may not upload the last pixels of the last one or more rows of a texture. The driver may also crash when the amount of overlap is high. This issue affects both TexImage* and TexSubImage* calls. Work around the issue by uploading textures row by row when the rows being read overlap in the unpack buffer. The workaround could possibly be optimized by uploading several of the first rows with a single call in some cases where the amount of overlap is low, but this is expected to be a rarely used corner case, so the added complexity that the optimization would create seems like a bad tradeoff. The issue does not seem to be triggered when the layers (images) of a 3D texture overlap, as long as the rows inside the images don't. The workaround has been ported from Chromium. This patch adds setting dirty bits when unpack state is set in StateManagerGL. The included test case also reveals some issue in the D3D backend, but this is left to be addressed later. BUG=angleproject:1376 TEST=angle_end2end_tests Change-Id: I7dbe73ebb70bbbc284fa92381546f4f2f832d333 Reviewed-on: https://chromium-review.googlesource.com/346430 Reviewed-by: Jamie Madill <jmadill@chromium.org> Commit-Queue: Olli Etuaho <oetuaho@nvidia.com>
- README.md
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ANGLE - Almost Native Graphics Layer Engine
The goal of ANGLE is to allow users of multiple operating systems to seamlessly run WebGL and other OpenGL ES content by translating OpenGL ES API calls to one of the hardware-supported APIs available for that platform. ANGLE currently provides translation from OpenGL ES 2.0 to desktop OpenGL, Direct3D 9, and Direct3D 11. Support for translation from OpenGL ES 3.0 to all of these APIs is nearing completion, and future plans include enabling validated ES-to-ES support.
| | Direct3D 9 | Direct3D 11 | Desktop GL | GL ES | |----------------|:-------------:|:-------------------:|:------------------:|:---------:| | OpenGL ES 2.0 | complete | complete | complete | planned | | OpenGL ES 3.0 | | nearing completion | nearing completion | planned | [Level of OpenGL ES support via backing renderers]
| | Direct3D 9 | Direct3D 11 | Desktop GL | |------------:|:--------------:|:--------------:|:-------------:| | Windows | * | * | * | | Linux | | | * | | Mac OS X | | | in progress | [Platform support via backing renderers]
ANGLE v1.0.772 was certified compliant by passing the ES 2.0.3 conformance tests in October 2011. ANGLE also provides an implementation of the EGL 1.4 specification.
ANGLE is used as the default WebGL backend for both Google Chrome and Mozilla Firefox on Windows platforms. Chrome uses ANGLE for all graphics rendering on Windows, including the accelerated Canvas2D implementation and the Native Client sandbox environment.
Portions of the ANGLE shader compiler are used as a shader validator and translator by WebGL implementations across multiple platforms. It is used on Mac OS X, Linux, and in mobile variants of the browsers. Having one shader validator helps to ensure that a consistent set of GLSL ES shaders are accepted across browsers and platforms. The shader translator can be used to translate shaders to other shading languages, and to optionally apply shader modifications to work around bugs or quirks in the native graphics drivers. The translator targets Desktop GLSL, Direct3D HLSL, and even ESSL for native GLES2 platforms.
Sources
ANGLE repository is hosted by Chromium project and can be browsed online or cloned with
git clone https://chromium.googlesource.com/angle/angleBuilding
View the Dev setup instructions. For generating a Windows Store version of ANGLE view the Windows Store instructions
Contributing
Join our Google group to keep up to date.
Join us on IRC in the #ANGLEproject channel on FreeNode.
File bugs in the issue tracker (preferably with an isolated test-case).
Choose an ANGLE branch to track in your own project.
Read ANGLE development documentation.
Become a code contributor.
Use ANGLE's coding standard.
Learn how to build ANGLE for Chromium development.
Get help on debugging ANGLE.
Read about WebGL on the Khronos WebGL Wiki.
Learn about implementation details in the OpenGL Insights chapter on ANGLE and this ANGLE presentation.
Learn about the past, present, and future of the ANGLE implementation in this recent presentation.
If you use ANGLE in your own project, we'd love to hear about it!